When I was sixteen I wrote a matched couplet upon reading the Sixth Patriarch Sutra. Having lectured to the place where the text says “Dharma is not sudden or gradual, confusion and enlightenment are slow and quick.” I thought, “How can there still be a sudden and a gradual? What is sudden? What is gradual? Are sudden and gradual different? Are they two?” So I wrote the following:

Although sudden and gradual are different,
Upon completion they are one.
Why make divisions of North and South?

Sagely and common are parts of the one:
The basic nature is absolutely the same.
Do not discuss East and West.

“Although sudden and gradual are different, upon completion they are one.” Sudden refers to instantaneous realization of Buddhahood; gradual refers to slow cultivation to Buddhahood. Sudden and gradual are two distinct methods, but when one finishes the work, there is no sudden and no gradual in evidence. They no longer exist. …

When I read the Sixth Patriarch Sutra, I thought that the reference to Sudden and Gradual lacked equality, so I wrote the line, “Although sudden and gradual are different, upon completion they are one.” What is the origin of sudden? Although one suddenly attains enlightenment, one cultivates life after life for a long time within the Buddhadharma prior to that enlightenment. When one reaps the fruit of that long process of cultivation, that is called sudden. Gradual refers to the long process of cultivation, but the day the cultivation is complete, there is sudden enlightenment. For that reason I say there is no sudden or gradual. …

“Sagely and common are parts of the One.” Sagely refers to the Buddha; common refers to living beings. The world is divided into these two types, but “the basic nature is absolutely the same.” Buddhahood is the realization of the Buddha-nature. Living beings can also realize their Buddha-nature.